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image of Israel Journal of Plant Sciences

The effect of light intensity on primary bean leaf unfolding and elongation was studied with intact and excised 10-day-old plants grown under red light. Continuous light of 40 μmol; m−2S−1 was enough to induce maximal leaf expansion both on intact and excised bean plants. Lower light intensities had a partial effect. The growth rate during the first 24 h in light was linearly related to light intensity up to 130 μmol; m−2S−1, although this light intensity was already supra-optimal for final leaf size. The minimal amount of light energy needed for full leaf expansion was about 15 mol photons m−2. The mode of light application, level of intensity, and irradiance duration were not critical when the total energy requirement was fulfilled. Under insufficient light applications for full leaf expansion, interrupted irradiance and longer low light intensity application induced leaf elongation more efficiently. Generally, the effect of different white light intensities on primary bean leaf expansion was the same on both intact and excised red-light-grown plants.

Affiliations: 1: Institute of Horticulture, Agricultural Research Organization, Volcani Center ; 2: Faculty of Agriculture, The Hebrew University of Jerusalem ; 3: Department of Botany, University of Washington


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1. Butler R.D."The effect of light intensity on stem and leaf growth in broad bean seedlings."J. Exp. Bot.1963Vol 14142152
2. Dale J.E."The control of leaf expansion."Annu. Rev. Plant Physiol. Mol. Biol.1988Vol 39267295
3. Dale J.E., Murray D."Photomorphogenesis, Photosynthesis, and early growth of primary leaves of Phaseolus vulgaris"Ann. Bot.1968Vol 32767780
4. Dale J.E., Murray D."Light and cell division in primary leaves of Phaseolus"Proc. R. Soc. London B.1969Vol 173541555
5. Lavee S., Van Volkenburgh E., Cleland R.E."Light-stimulated leaf growth on intact and excised bean plants (Phaseolus vulgaris L.)."I. Characterization of basic responses. Isr. J. Plant Sci.1999aVol 47141145
6. Lavee S., Van Volkenburgh E., Cleland R.E."Light-stimulated leaf growth on intact and excised bean plants (Phaseolus vulgaris L.)."II. Effect of light duration and timing of application. Isr. J. Plant Sci.1999bVol 47147152
7. Van Volkenburgh E., Cleland R.E."Separation of cell enlargement and division in bean leaves."Planta1979Vol 146245247

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